''Magic'' Johnson, Michael Cooper, James Worthy and Mitch Kupchak were handed subpoenas to act as witnesses in a suit seeking $100,000 from teammate Kurt Rambis. Paul Baribeau, 26, of Lynn, Mass., claims he was punched in the nose by Rambis last year while fans rushed onto the Boston Garden court after the Celtics beat the Lakers in the seventh game to win the NBA title.